Add HTML Linter (#998)

.github/linters/.htmlhintrc

@@ -0,0 +1,25 @@
+{
+  "alt-require": true,
+  "attr-lowercase": ["viewBox"],
+  "attr-value-double-quotes": true,
+  "attr-value-not-empty": false,
+  "attr-no-duplication": true,
+  "attr-unsafe-chars": true,
+  "doctype-first": false,
+  "doctype-html5": true,
+  "empyty-tag-self-close": true,
+  "id-unique": false,
+  "id-class-value": true,
+  "head-script-disabled": false,
+  "href-abs-or-rel": false,
+  "id-class-ad-disabled": true,
+  "inline-style-disabled": true,
+  "inline-script-disabled": true,
+  "space-tab-mixed-disabled": "space",
+  "spec-char-escape": false,
+  "src-not-empty": true,
+  "style-disabled": false,
+  "tag-pair": true,
+  "tagname-lowercase": true,
+  "title-require": true
+}

.github/workflows/linter.yml

@@ -28,7 +28,7 @@ jobs:
       - name: Checkout Code
         uses: actions/checkout@v2
       - name: Lint Code Base
-        uses: docker://github/super-linter:v2.2.0
+        uses: docker://github/super-linter:v3.3.0
         env:
           VALIDATE_ALL_CODEBASE: false
           DEFAULT_BRANCH: main
@@ -38,3 +38,4 @@ jobs:
           VALIDATE_JAVASCRIPT_ES: true
           VALIDATE_CSS: true
           VALIDATE_MD: true
+          VALIDATE_HTML: true